django-taggit on models with UUID as pk throwing out of range on save

Question

I have models that uses UUID as its PK

class Foo(models.Model):        
    foo_id = models.UUIDField(  
        primary_key=True,             
        default=uuid.uuid4,           
        editable=False                
    )  
    tags = TaggableManager()        

When I go and try to add a new tag

f = Foo.objects.latest('pk')
f.tags.add("testing")

I get DataError: integer out of range

When I import pdb on the cursor to view the SQL going in I see this.

(Pdb) params                                                                                                              
(1, 287082253891563438098836942573405313042, 9)                                                                           
(Pdb) sql                                                                                                                 
'INSERT INTO "taggit_taggeditem" ("tag_id", "object_id", "content_type_id") VALUES (%s, %s, %s) RETURNING "taggit_taggedit
m"."id"'    

That long integer (287082253891563438098836942573405313042) trying to be insterted is obvsiouly the cause for the error. This number is the int of the UUID for foo_id

In [6]: foo.foo_id.int                      
Out[6]: 287082253891563438098836942573405313042  

Is there something I can set to allow django-taggit to play nicely with contenttypes and UUID?

Answer 1

I'd like to extend @Pramod response, that was very helpful for me to find the right answer:

Taggit has another class that allows to change the behavior of the TaggedItem

Here is a snippet of how to implement this solution:

from django.db import models
from django.utils.translation import ugettext_lazy as _

from taggit.managers import TaggableManager
from taggit.models import GenericUUIDTaggedItemBase, TaggedItemBase

class UUIDTaggedItem(GenericUUIDTaggedItemBase, TaggedItemBase):
    # If you only inherit GenericUUIDTaggedItemBase, you need to define
    # a tag field. e.g.
    # tag = models.ForeignKey(Tag, related_name="uuid_tagged_items", on_delete=models.CASCADE)

    class Meta:
        verbose_name = _("Tag")
        verbose_name_plural = _("Tags")

class Food(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    # ... fields here

    tags = TaggableManager(through=UUIDTaggedItem)

source: http://django-taggit.readthedocs.io/en/latest/custom_tagging.html#genericuuidtaggeditembase

Answer 2

这是基于奥斯汀评论的答案。

在 中django-taggit，对标记模型的引用存储在名为 的GenericTaggedItemBase字段下命名的模型中object_id。该object_id字段被硬编码为models.IntegerField. 因此不可能标记具有 UUID 主键的模型。代码位于此处。

如果需要标记的所有模型都属于同一类型（在本例中为models.UUIDField），那么您可以将object_id的类型设置为models.UUIDField。

假设您正在使用，以下是必须进行的更改virtualenvwrapper

1. taggit在站点包文件夹中找到该包。~/virtualenvs/<your_virtualenv>/lib/<python_version>/site-packages/taggit

2. 将目录复制taggit到您的项目中。

3. 删除该taggit目录site-packages

4. 在models.py文件中taggit，替换

object_id = models.IntegerField(verbose_name=_('Object id'), db_index=True)和

object_id = models.UUIDField(verbose_name=_('Object id'), db_index=True)

5. 迁移 taggit。

python manage.py makemigrations taggit

python manage.py migrate